Zakat calculator

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Features

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Result summary card

• Zakat due amount: Large, bold display of calculated Zakat
• Percentage: “2.5% of eligible wealth” explanation
• Nisab status: Whether wealth exceeds the nisab threshold
• Nisab type: Gold or Silver standard used
• Nisab value: Current threshold amount in user’s currency

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Nisab type selector

• Weight: 87.48 grams (7.5 tola)
• Updates with current gold price per gram
• Typically results in higher threshold
• Displayed with gold accent color

• Weight: 612.36 grams (52.5 tola)
• Updates with current silver price per gram
• Generally results in lower threshold
• Displayed with silver accent color

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Assets section

• Cash on hand (physical currency)
• Bank balance (all accounts combined)

• Gold (entered in grams, converted to value)
• Silver (entered in grams, converted to value)

• Investments (stocks, bonds, mutual funds)
• Business inventory (goods held for trade)
• Receivables (money owed to you)
• Rental income (from properties)

• Any other zakatable assets

• Colored icon representing the asset type
• Asset label and description hint
• Compact amount input field with currency prefix
• Real-time total calculation

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Liabilities section

• Debts owed (personal debts)
• Loans (bank or personal loans)
• Bills due (outstanding bills)
• Other liabilities

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Calculation breakdown

1. Total assets: Sum of all asset values
2. Total liabilities: Sum of all debts (shown with minus)
3. Net zakatable wealth: Assets minus liabilities
4. Nisab threshold: Current nisab value
5. Meets nisab: Yes/No indicator (green/red)
6. Zakat due: Final 2.5% calculation

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How users interact

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Initial calculation

1. Select nisab type: Choose gold or silver standard
2. Enter assets: Input all applicable asset values
3. Enter liabilities: Input any debts or liabilities
4. View result: Zakat amount calculates automatically

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Input management

• Tap any input field to activate keyboard
• Enter numeric values (decimal supported)
• Currency prefix ($) displays automatically
• For metals, enter weight in grams with “g” suffix
• Empty fields treated as zero

• Zakat updates instantly as values change
• No calculate button needed
• All displays refresh automatically
• Progress tracked in real-time

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Saving calculations

1. Review the calculation breakdown
2. Tap “Save Calculation” button at the bottom
3. Calculation saved to history with timestamp
4. Includes all entered values and results

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Accessing history

1. Tap the history icon in the top app bar
2. View previous Zakat calculations
3. See dates and amounts from past calculations
4. Track Zakat payments over time

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Resetting calculator

1. Tap the refresh icon in the top app bar
2. All input fields clear to zero
3. Calculation resets
4. Start fresh calculation

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Calculation method

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Nisab threshold

nisabValue = nisabWeight × metalPricePerGram

nisabValue = 87.48g × goldPrice

nisabValue = 612.36g × silverPrice

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Net worth calculation

totalAssets = cash + bank + goldValue + silverValue + 
              investments + inventory + receivables + 
              rental + other

netWorth = totalAssets - totalLiabilities

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Zakat due

if (netWorth >= nisabValue) {
  zakatDue = netWorth × 0.025  // 2.5%
} else {
  zakatDue = 0
}

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Metal value conversion

goldValue = goldGrams × goldPricePerGram
silverValue = silverGrams × silverPricePerGram

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Input card design

• Icon in colored rounded square (40dp)
• Two-line text (label and hint)
• Compact input field (100dp width)
• Rounded corners (14dp radius)
• Surface container high background

• Cash: Gold accent
• Investments: Primary color
• Liabilities: Red/error color
• Metals: Gold/silver accent colors

• Displays current value or zero placeholder
• Currency prefix for monetary values
• Weight suffix (“g”) for metals
• Decimal keyboard for numeric entry
• Right-aligned text display

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Breakdown display

• Section title: “Calculation Breakdown”
• Rounded card with padding
• Rows with label and value pairs
• Horizontal dividers for sections
• Bold text for key totals

• Assets: Primary color
• Liabilities: Error/red color (with minus)
• Net worth: Default color, bold
• Nisab status: Primary (yes) or error (no)
• Zakat due: Gold color, bold

• Full-width primary colored card
• Centered white text
• “Save Calculation” label
• Rounded corners
• Tappable for saving

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Technical implementation

• ZakatModels.kt - Data models and calculator
• ZakatCalculatorScreen.kt - Main calculator UI
• ZakatHistoryScreen.kt - Saved calculations
• ZakatViewModel.kt - State management

• ZakatAssets - All asset categories
• ZakatLiabilities - All liability categories
• ZakatCalculation - Complete calculation result
• NisabType - Gold or Silver enumeration
• MetalPrice - Current metal prices

• Rate: 2.5% (0.025)
• Gold nisab: 87.48 grams
• Silver nisab: 612.36 grams